fix erase filter malfunction
having a filter condition set for the erase method caused the whole data table to be dropped.
Allow lowercase folder names
Fixes to Mongo Mapper's select function for group operations:

1) Corrected mongo group parameters (finalize)
2) Store just the 'retval' value from mongo group in temp collection
3) Drop temp table after reading results instead of before
Made Mongo Mapper select fixes safe for php 5.3
Merge pull request #423 from eschultz/dev

Fixes to Mongo Mapper's select function for group operations:
Minor cleanup
Verify folder existence; Create if necessary
Bug fix: PHP globals passed by reference in hive() result (Issue #424)
Redux: PHP globals passed by reference in hive() result (Issue #424)
Remove remnants of buggy code
Twice redux: PHP globals passed by reference in hive() result (Issue #424)
Implement apcu backend's reset()
Thrice redux: PHP globals passed by reference in hive() result (Issue #424)
Revert to 2.x multiline behavior
Bug fix with test case: PHP globals passed by reference in hive() result (Issue #424)
Revert
Merge pull request #420 from ikkez/jig-delete-fix

[Jig Mapper] erase filter malfunction
Minor cleanup
Prevent in-place array replacement (Issue #424)
Capture full X-Forwarded-For header